聚氨酯夹芯屋面板的风致动力性能分析  

Analysis on wind-induced dynamic behaviors of polyurethane sandwich roof panels

作　　者：邓华[1] 黄莉[1,2] 王宸[1] 

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058 [2]浙江财经大学工程管理系,浙江杭州310018

出　　处：《浙江大学学报（工学版）》2013年第12期2125-2131,2175,共8页Journal of Zhejiang University：Engineering Science

摘　　要：聚氨酯夹芯屋面板广泛应用于大跨度结构的屋盖系统中,其有限刚度及聚氨酯芯层的阻尼性能会对屋面风压传递过程的脉动特性造成影响.试验测定了屋面板常用聚氨酯泡沫夹芯材料的基本力学参数和反映材料阻尼特性的损耗因子.以一典型檩距的四角点简支矩形屋面板为算例,采用模态应变能法对该屋面板的结构损耗因子进行了计算.进一步对该屋面板模型施加人工模拟的风压时程,并与无阻尼刚性板和低阻尼柔性板模型的反力时程及其功率谱进行对比,考察了屋面板刚度和阻尼性能对风压脉动特性的影响程度.结果表明:屋面板的实际有限刚度对风压的脉动分量有放大作用,且改变了脉动风压的频谱特性,而聚氨酯夹芯的阻尼性能却能有效降低脉动风压的放大幅值.Polyurethane sandwich panel is widely used as the roof covering of large-span structures.Its finite stiffness and damping properties of polyurethane core would make substantial effects on the properties of the fluctuating wind pressure when transmitted by the roof panel.Experimental tests were carried out to determine the basic mechanical parameters of the polyurethane core normally used in metal roof panels,and the loss factor indicating its damping properties was also measured.A rectangular roof panel,which was pin-supported at four corners with a typical supporting distance of purlins,was employed as an illustrative example.The structural loss factor of this roof panel was calculated by the modal strain energy method.An artificial wind pressure was further applied on this roof panel,and the time history of reaction force and its power spectrum were calculated and compared with those of another two models,the undamped rigid panel and the underdamped elastic panel.The effects of its stiffness and damping property on the properties of fluctuating wind pressure were investigated.The results reveal that the finite stiffness of the roof panel can not only lead an amplification of fluctuating wind pressure,but also change its spectral properties.However,the damping property of polyurethane core can effectively reduce the amplifying magnitude of the fluctuating wind.

关 键 词：金属屋面板 聚氨酯夹芯板 损耗因子 脉动风 动力性能 风致振动 

分 类 号：TU393.3[建筑科学—结构工程] TU532.4